1231121223 has 12 divisors (see below), whose sum is σ = 1779047608. Its totient is φ = 820396080.

The previous prime is 1231121183. The next prime is 1231121231. The reversal of 1231121223 is 3221211321.

It is not a de Polignac number, because 1231121223 - 2⁶ = 1231121159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231121196 and 1231121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231121263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6133 + ... + 49998.

Almost surely, 2^1231121223 is an apocalyptic number.

1231121223 is a deficient number, since it is larger than the sum of its proper divisors (547926385).

1231121223 is a wasteful number, since it uses less digits than its factorization.

1231121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58574 (or 58571 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1231121223 is about 35087.3370747910. The cubic root of 1231121223 is about 1071.7667330381.

Adding to 1231121223 its reverse (3221211321), we get a palindrome (4452332544).

The spelling of 1231121223 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-three".